Foundry joit squeezer



Dec. 25, 1928..- 1,696,669

E. J. BYERLEIN FOUNDRY JOLT SQUEEZER Filed Aug. 20. 1926 4 Shuts-Sheet 1 FIZZ- I N V EN TOR.

ATTORNEYS.-

Dec. 25, 1928.

E. -J. BYERLEIN FOUNDRY JOLT SQUEEZER Filed Au 20'. 1926- asmnwsnn 2 E. J. BYERLEIN I FOUNDRY JOLT SQUEEZER Filed Aug. 20. 1926 4-Sheovts Sfieet 5 Dec. 25, 1928.

E. J. BYERLEIN FOUNDRY JOLT SQUEEZER Fil ed Aug. 20. 1926 4 Sheets-Sheet; I 4

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Patented Dec. 25, 1928.

PATENT OFFICE.

EBLE J. BYERLEIN, OF WAUWATOSA, WISCONSIN.

FOUNDRY JOLT SQUEEZER.

Application filed August 20,

This invention relates to improvements in foundry jolt squeezers.

Molding machines of the ordinary type are usually arranged to impart a rapid reciprocating movement to the molding flask to initially pack the molding sand around the pattern within the flask before the sand is subjected to the final squeeze and the removal of the pattern from the sand and flask. A fluid under pressure means is usually used to reciprocate the parts.

It is one of the objectsof the present invention to provide a foundry jolt squeezer of the type mentioned which automatically packs the sand around the pattern within the flask, and then strips the pattern from the mold on the exhaust stroke of the squeezing operation.

A further object of the invention is to pro-- vide a foundry olt squeezer arranged so that the operator may stand in one position and fill the flask and then operate the machine to give a few jolts and squeezes and then draw the pattern from the mold.

A further object of the invention is to provide a foundry jolt squeezer which is of very simple construction, is easy and rapid 1n operation, is strong and durable, and is well adapted for the purpose described.

iVith the above, and other objects in view, the invention consists of the improved foundry jolt squeezer, and its parts and combinations as set forth in the claims, and all equivalents thereof.

In the accompanying drawing in which the same reference characters indicate the same parts in all of the views:

Fi 1 is a side view of the improved foundry jolt s ueezer; V

Fig. 2 is a ront view thereof, part being taken in vertical section;

Fig. 3 is a top view;

Fig. 4 is a vertical sectional view taken on line 44 of Fig. 3;

Fig. 5 is a sectional View taken on line Fig. 6 is asectional view taken on line 6-6 of Fig. 4:.

Referring to the drawings, the numeral 8 indicates a frame which is in the form of a standard having a cylinder 9 mounted on its lower portion and a swingable arm 10 at its upper portion which carries a platen or pressure member 11. The said platen is con- 192e. Serial No. 130,437.

guide pistons 17. Said. guide pistons 17 operate in. guide cylinders 18 which are connected to the cylinder 9 and the frame 8 and are parallel to said cylinder. The guide cylinders also serve as dash pots and contain oil to cushion the downward movementof the guide pistons 17 and the stripping frame 19 which is secured to the upper ends of said pistons by nuts 20. The flask 13 and the stripper plate 2l are secured to and carried by the stripper frame 19 while'the head 15 is adapted to carry the pattern plate (not shown).

The piston 14 is formed with an inner and an outer wall in spaced relation and the inner wall 14 serves as a cylinder for a piston 15 forming part of the head 15. The smaller piston functions to jolt the flask to pack the sand therein on its exhaust stroke, and the larger piston serves. to squeeze the sand around the pattern and to strip the pattern from .the sand. Air is supplied to the large cylinder 9 by a pipe 22 which is controlled by a valve 23 and air is also supplied to the upper end of the piston by a pipe 24, also controlled by the valve 23; A portion of the pipe 24, as at 24/, is flexible to permit movement of the piston,

The piston 15 is open at its lower end and is provided with a medial partition 25 dividing the space into upper and lower compartments or chambers 26 and 27, and said partition has a small opening 28, of less diameter than the bore of the inlet pipe22, to retard the flow of air'therethrough. The piston 14 is provided with a discharge opening 29 extending through the wall 14: thereof, and

when the piston 15 reaches its lowermost position with relation to said wall 14, the air is trapped between the two pistons, and the downward movement of the piston 15 will be cushioned to prevent injury to the sand mold. The proportions of the openings 28 and 29 are such that the admission of air under pressure to the piston 15' will cause said piston to move upwardly until the larger opening 29 is uncovered and the rapid discharge of air therethrough will permit said piston to drop until said. opening 29 is again covered and the pressure will again force the piston upwardly and these repeated reciprocations will cause the sand to be tightly packed around the pattern within the flask. W hen the air valve is closed to stop the jolting, the comparatively considerable amount of air under pressure in the upper compartment 26 in expanding will pass through the restricted opening 28 to supply sufficient air to cushion the rebound stroke of the jolting piston and prevent premature movement between the flask and the stripping members,

which occurs in jolt squeezers of ordinary construction.

In the jolting operations, the piston 15 and parts carried thereby move independently of the larger piston 14. However, in the squeezing and stripping operations, the pis ton 14: is caused to move and moves the inner piston 15 and engaged parts therewith. As mentioned, the piston l-jis moved by means of air supplied thereto by means of the pipe 22.

Pivoted arms 30, connected by a bar 31 are adapted to ride against the inner depending walls of the stripping frame 19 and when the piston'l i moves to its uppermost posiiion wherein the stripper plate is in the dotted line position shown in Fig. 4, said arms 30 engage adjusting set screws 33 under the edge portions 32 of the stripping frame 19 to hold the same in its upper position. The arms 30 are automatically urged outwardly by means of a weighted arm 34.

and a lever 35 is connected thereto to manuala ly trip the device to lower the stripping plate to normal position, when desired.

From the foregoing description, it will be seen that the improved foundry jolt squeezer is of very simple and novel construction, and is well adapted for the purposes described.

What I claim as my invention is:

1. A foundry jolt squeezer, comprising a frame, a pair of pistons mounted in said support of relatively different diameters and movable together or independently, a pair of opposed guide members carried by the frame, a head slidably mounted on said guide members and operatively connected to one of the pistons to have a relative movement with respect thereto, a stripper frame secured to and movable with said guide members and supported by said head, a pressure member,

releasable means engaging the under surface of'the stripper frame to hold it in an elevated position, and compressed air controlled means to operate the pistons in unison or independently.

2. A foundry jolt squeezer, comprising a frame, a platen arm carried thereby, a head member, a flanged stripper member, means for moving said members toward and away from the platen a 'm, and means for holding the stripper member in an elevated position, said means including a pair of oppositely pivoted arms engaging the inner surface and bottom edge of the flange of the stripper member, a lever pivotally connected to said arms, and a weighted member connected to one of said arms.

3. in a molding machine, the combination of a. frame, a swinging platen arm carried at one end portion bythe frame, there being a surface contact between the frame and an intermediate portion of the arm in one position to rigidly brace the arm, a head member formed with a pair of obliquely extending lugs, a pair of opposed guide pistons carried by the frame and slidably received by the obliquely extending lugs, a stripper member lidaliily carried only by said pair of guide )istons above said head member and moving with said guide pistons, a piston movable with said head member, a second piston hav ing a cylinder for the first mentioned piston, means whereby the inner piston may move to cause a reciprocatory movement to be imparted to a flask supported by the stripper member, and the two pistons moved in unison to squeeze sand about patterns in the flash,

opposedweighted arm means directly engaging under portions of the stripper member to releasably support it in an elevated position, and means for lowering the head member independently of the stripper member.

a. A foundry jolt squeezer, comprising a frame, a head member formed with a pair of obliquely extending lugs, a single pair of guide pistons carried by the frame and slidably extended through said lugs, the head being slidably movable on and guided in its movements by only said pair of guide pistons, a stripper member secured only to said pair of guide pistons above said head member and movable with said guide pistons, said single pair of guide pistons serving to hold the head member and stripper member in alinement at all times, and guiding the movements of both members, means for rapidly reciprocating said stripper member and head member in unison, and means for lowering the head member independently of the stripper memher.

In testimony whereof, I affix my signature.

anion J. BYERLEIN. 

